Plastic cementitious material



IVVI UVIIII vs: I a

v a nt my10,1921. i g p 1,627,95Z f ifUNITED-STATES 2:1?ATENT *OFFICE.

' E.IBBDOKIBY, OF EVANSTON, ELIR'OIS, ASSIGYOR TO UNITED STATES GYPSUM YOF CHICAGO, ILLINOIS, A, CORPORATION OF ILLINOIS.

I 'PLABTIG OEHENTITIOO'S. IA'JPEIBCLAIL.

Io Drawing. ap lication fled August s, 1923. ierial No. 856,455.

This invention relates to improvements in In carrying out thisinvention, commercial plastic material and more particularly tohydraulic cemenLis placed in a blending: the production of plasticcementitious maor mixing ap aratus of any desired type a;

, terial for use as a mortar, stucco orplaster. gether with t epredetermined ercenta e of 5 It is an object of this invention to pro-.finel round clay and hy drated lime, vide a cement mortar that willpossess suib en e together to .a homogeneous mixture ficient adhesiveand, at .the same time, and sacked forthe market. Theamounts of lspreading qualities to make it advantageous clav anilimejg be addeddepend upon the for interior plastering and exterior stucco plasticityto be imparted and the final I in plastering in the erection of housesand other strength of the mortar that must be main- 6 buildings. tained.It has been determined that the 1 Portland ce'mgg ral h draulic cem ntproportions of six pounds of Fglely powdered s an 0- er cemen itioussubances are not lastic 1 hin colloida c a su ance, Beni n 1) practicalas mortar bases for this character a six oun y a e umixe w1 l p 15 ofapplication on account of the lack of plaseighty-eight pounds ofhydraulic cement ticit or spreading eflualities under the produce aplastic product capable of making mec anics tools as w as the lack ofada good cohesive wet mortar with three arts "hesion, and such mortarsare termed in the of sand and still maintain the approximate trade asshort working. Such materials structural value of cement mortar without20 have been made adaptable for these uses by such additions. If desiredthe constituent the addition of lime putty or hydrated lime materials ofthis mi'r'ovEcl muct ma 5E in var-yin proportions as the mortar isberoun I e er an may geous 1 .ing mix but to be practicable it r uiresat times, depending u on the fineness of the flsuch-a large pro ortionof the lime ad 'tion hydraulic" cement an the econp ical han- 1 25 tosecure sprea mg properties'for satisfacdling of the clay and lime used ir ifiemixtory and economical application by a meture. When the materialsare ound tochanic that the strength of the resultant ether Imam! e a 1ion i cement mortar is lessened to such a degree 0 a n e Flag sustancesuc as s1 ica sand that the finished structural valueismarkedly or Mimes ne w asslst the reducing p weakened. I of c'o'arser cementparticles to more of a It is the purpose of this invention to imflourstate with ahigher percentage of ultrapart the necessarily desiredplastic spreadfine particles and produce a more desirable. a ping andadhesive qualities to such cementiproduct without a ecting the desiredqualities of the cement mortar so formed.

" I tious substancesby inco rat .35 centage 9f finely l vie rated limThisimproved product may-be produced 1 a sma ercenta and marketed neator the usual aggregates e of fine y last1c c a su 'may be added beforesacking so that it may or an other la 10 f; occulatfi w 7 m e molecularcon-. ous stucco and plaster bases are now e0 centra 101115815 tesmallpercentage of lime marketed. an architect specifies a s be marketed inthe same manner as the variwould occasion inthe cement mortar. "Whencement -mortar ojf definite strength the such clays are flocculated theycontract, strength of such guitar is actually assured shrink and, at thesame time, necessarily a in the mortar produced in accordance with:develop more densit and increased internal this invention,ikewisestucco and plaster of 4a adhesion so that when this reactiontakes 'definite' specified strength are produced as place. in the cementmortara remarkable plasticity and spreadin quaht es are 11m increase inthe internal cohesion vof'ythe parted 'tothe cement wit out theheretofore *mortanwhen-mixed, takes place, resulting in gossin.structuralvalue. And by this mveni the :mortar ,hecomin 1ilastic andeasil *tionjthedefinite'structural'valuespecified'm fil -spread.aeresultt 'scementmortar w' l the -;cement is maintained throughout the9 carry about three arts-of sand and main-5' pphcatfon and setting ofthisim tain'suflicieiit plasticityiand adhesion' to prov T orta 1",' stue rplaster. p a liedvby worln s g l s mggba e 151;; 2 3; ,iorinteriorwalls nanoutsi e'stucco'plaster 1. igisplast cPceinentitiousfimaterial-.com-'.' #55. without-undue physical effort ontheirpart.

p i n eas s. we

sveipht of h draulic cement, six 0: of finey divid 0 1 an s parts of 5prising a mixture of hydraulic cement with finely divided plastic clayand finely divided hydrated lime,

the clay and lime not in excess of fifteen percent y weim'z 3. A plasticcementitious material comiimy'dfvidea ydrated me.

. p astic cementitious material comprising Found together hydrauliccement, plastic c ay and hydrated lime.

4. "The process for producing a plastic cementitious material comprisingthe grinding together of dry hydraulic cement, plastic clay, hydratedlime and a gritty substance to reduce the ingredients of the mixture toa finely divided state.

HARRY E. BROOKBY.

